Gina Mestre, who left the New York Police Department in 2022, said she had helped a Bronx gang leader avoid arrest after he killed a member of a rival gang.
Ms. Vallow Daybell was convicted in Idaho in May in the murders of two of her children and of conspiring to murder her husband’s previous wife. She faces charges in other cases.
Many law enforcement agencies have curbed pursuits because of their inherent danger. But some Texas authorities see them as necessary for border security.
Ms. Armstrong fled the United States and went to Costa Rica after she was named as a suspect in the killing of Ms. Wilson, a 25-year-old professional cyclist.